检测2,4-D的一次性安培型免疫传感器

2,4-D是广泛使用的除草剂,以2,4-D为检测目标,研究了安培型免疫传感器.首先采用1-乙基-3-(3-二甲基氨丙基)碳二亚胺盐酸盐(EDC)作为交联剂制备2,4-D与BSA以及PLL的偶联物.用结合比1∶16的2,4-D与偶联物制备兔抗血清.免疫传感器的制备包括2个步骤,使用丝网印刷工艺制备一次性碳电极,然后通过戊二醛交联在电极表面固定2,4-D与多聚赖氨酸(PLL)的偶联物.待测水样与2,4-D抗血清和HRP酶标二抗进行间接免疫竞争反应.在HRP酶在邻苯二胺和H₂O₂的共同作用下发生酶促反应,检测还原电流以反映2,4-D的浓度.试验了不同浓度抗血清和酶标二抗对检测信号的影响,结果表明,2,4-D的检测下限达到1.69ng/mL,线性区间1.69～30 000ng/mL,适合饮用水中2,4-D的检测要求.     

Emissions of parent, nitrated, and oxygenated polycyclic aromatic hydrocarbons from indoor corn straw burning in normal and controlled combustion conditions

Emission factors （EFs） of parent polycyclic aromatic hydrocarbons （pPAHs）, nitrated PAHs （nPAHs）, and oxygenated PAHs （oPAHs） were measured for indoor corn straw burned in a brick cooking stove under different burning conditions. The EFs of total 28 pPAHs, 6 nPAHs and 4 oPAHs were （7.9 ±3.4）, （6.5 ±1.6）×10^-3, and （6.1 ±1.4）×10^-1mg/kg, respectively. Fuel charge size had insignificant influence on the pollutant emissions. Measured EFs increased significantly in a fast burning due to the oxygen deficient atmosphere formed in the stove chamber. In both restricted and enhanced air supply conditions, the EFs of pPAHs, nPAHs and oPAHs were significantly higher than those measured in normal burning conditions. Though EFs varied among different burning conditions, the composition profiles and calculated isomer ratios were similar, without significant differences. The results from the stepwise regression model showed that fuel burning rate, air supply amount, and modified combustion efficiency were the three most significant influencing factors, explaining 72%-85% of the total variations.     

Precise Engineering of Lignin Incorporated Dextran/Glycol Nanomaterials for Wound Dressings for the Care of Anorectal Surgery

Journal of Polymers and the Environment - Lignin-loaded nanoparticles are versatile nanomaterials that may be used in wound healing properties. The current study describes a wound dressing...     

基于精细化管理的环境物联网发展趋势

环境物联网运用智能传感器等设备感知生态环境的变化,监测环境质量、监控企业的排污行为,通过环境数据的采集、传输、处理、整合,辅助环境管理决策。近年来环境物联网得到长足发展,但现有的环境物联网体系无法满足多种任务和应用场景的需求,主要问题体现在数据质量和精准度缺乏保证,数据传输能力有限,数据共享还未打通,数据分析应用能力还有待提升。笔者系统分析了环境物联网感知层、传输层和应用层的现状与问题,较全面地研究了物联网与大数据技术的最新进展,提出了环境物联网的发展方向以解决上述问题,为实现精细化管理与科学决策提供科学参考。     

Towards the analysis of urban livability in China: spatial–temporal changes,regional types,and influencing factors

Environmental Science and Pollution Research - The increasing drift of urbanization and its impact on urban human settlements are of major concern for China cities. Therefore, demystifying the...     

Transformation of sewage sludge into activated carbon by molten salt synthesis for adsorption of CO2 and dyes

Environmental Chemistry Letters - Wastewater treatment generates increasing amounts of unwanted sewage sludges, calling for advanced recycling methods. Here, we transformed sewage sludge into...     

Preparation of sludge-based materials and their environmentally friendly applications in wastewater treatment by heterogeneous oxidation technology

Environmental Science and Pollution Research - The sludge resource utilization and the high value-added development are environmentally friendly means for sludge treatment. With its rich organic...     

Impact of advanced storage facilities on households’ maize storage losses and food security in China

Environment, Development and Sustainability - Reducing post harvest losses has been an option to enhance food security. Hence, the Chinese government has implemented the “scientific grain...     

2020—2022年全国入海河流总氮浓度时空特征

根据全国230个入海河流断面2020—2022年总氮质量浓度监测数据,基于时间序列统计方法和空间聚类方法,分析了总氮浓度的时空分布特征。结果显示:2020—2022年全国入海河流总氮年均质量浓度逐年上升,从(3.24±2.20)mg/L上升到(3.92±3.30)mg/L;年内总氮浓度呈现冬高夏低、春秋居中的V形季节变化规律。空间聚类分析表明:总氮质量浓度从北到南可分为4个有较明显差异的区域,分别为北方高值区(包括辽东丘陵西部、辽西丘陵、山东丘陵),北方次高值区(包括环渤海京津冀地区、苏北平原),华东区(包括长江中下游平原区、上海市、浙江省、福建省),华南区(包括广东省、广西壮族自治区、海南省)。总氮年均质量浓度分布为北方高值区>北方次高值区>华东区>华南区。北方高值区的过高总氮浓度对全国总氮浓度均值提供了超比例的贡献。同时,北方高值区和北方次高值区贡献了2020—2023年全国总氮浓度92%的增幅。此外,从空间分布上看,越往北,总氮浓度的V形季节变化规律越明显。     

The impact of high-tech product export trade on regional carbon performance in China: the mediating roles of industrial structure supererogation,low-carbon technological innovation,and human capital accumulation

Environmental Science and Pollution Research - The role of expanding the proportion of high-tech products in the export trade of various countries to identify the appropriate export structure has...